Gas burner



' N. B. DENISON.

GAS BURNER.

APPLICATION FILED MAR. 12', 1920.

1,412,044, Patented Apr. 11, 192 2.

3 SHEETS-SHEET I- N. B. DENISON.

GAS BURNER.

APPLICATION man MAR. 12. 1920.

Patented Apr. 11, 1922.

3 sums-sneer 2.

N. B. DEN'ISON.

GAS BURNER.

APPLICATION FILED, MAR. 12, 1920. v I 1,41 2,044. Patented p 11-, 1922.

3 SHEETS-SHEET 3.

NATHAN B. DENISON, or PAWTUGKET, .nzions. ISLAND, AssIeNonro .PEERLESS BAKING EQUIPMENT coi/rPaNY, or BOSTON, vMassAcHi1sr/r'rs, 'A GORPORA-' TION OF MASSACHUSETTS.

GAS BURNER.

- Specification of Letters Patent. P t t dA 11, 1 22 Ap plication filed March 12, 1920. Serial No. 365,300.

To all whom it may concern V Improvements in Gas Burners, of which the following description, in connection with the Be it known that I, NATHAN B. DnNIsoN, a citizen of the United States, reslding at Pawtucket, in the county of Providence and State of Rhode Island, have invented certain accompanying drawings, is a specification,

like reference characters on the drawings in-' ovens and the like. 7

. Theinvention aims to devise an apparatus of this character which can be economically "manufactured, in which a very complete V and the combustion of the gas' can be ,obtained,

which shall be convenient to control, and with. which the danger of explosions Wlll. be eliminated. .The nature of the invention] will be readily understood from the follow ing description when read connection with the accompanying drawings, and the novel features will be particularly pointed out inthe appended claims.

Referring now to the drawings, g Figure 1 is an end elevation of an oven equipped with a burner. mechanism constructed in accordance with the present invention;

Fig. 2 1s a side elevation of the parts of .the burner mechanism with which we are more particularly concerned here;

3 is a plan view of-the mechanism shown in Fig. 2.; V v I 1 Fig. 4 is a cross sectional view of the valve forthe mairiburner; V

-F'g. 5 is a side elevation of the-pilot burner; r Y

Fig. 6 is a plan view of the controlhandle parts immediately associated therewith; I Y

Fig. 7 is a front elevation of the parts shown in.Fig. 6;

V ig. 8 is a cross sectional view of the main burner; e v

Fig. 9 is a planview partly in cross section of the pilot burnerf valve and the operating means therefor; and e V Fig. 10 is a plan view of a modified con .struction.

I 2, Fig. Let a horizontal cylindricaltype widely used in bakeries. The main burner 3, Figs. 2 and 3, extends longitudinally of the oven 2 immediately below it, the bottom of the oven beingcut away, as'indicated at 4,

gm e i ely over the burner.'- This burner isconnected by'ja pipe 5 to a mixing valve-6 ofany suitable construction, herein shown as the well known Hale gas mixer. This mixer includes a valve '7 provided with aplugiS having a slot therethrough and mounted to rotate in the valve casing. stem 9 projects-from the upper end of the' valve plug 8. Gas is led .to the valve by a pipe linelO inwhich is connected a hand valve (not shown) that controls the supply of gas to the entire apparatus.

The pilot burner is designated at 12, the

particular, form shown being that known commercially as the Rutz pilot. This pilot -burner includes'a combustion chamber 13 having a port in the side thereof adjacent to the main burner 3 through which the flame shoots across the main burner. The flow of gas to thispilot is controlled by. avalve 14 which is suppled by a pipe line 15 leading from the main line 10, a hand valve 16 be- 7 ing included in the pipeline 15. Normally' the valve 16 is open and the' pilot is lighted but only a very small flow of gas is supplied to thepilot since the plunger 17 of the pilot valve 14, Fig. 9, is normally jkept "closedby a spring 18 and the gas that flows to the burner escapes through the small passage 19/ When the main burner is to be turned on, however, a larger flame 1s desired and a novelanechanism is provided whereby both-burners are controlled by a single operating-mechanis For. this pur-' pose a' vertical rod or shaft 20 is mounted in upper and lower bearings 21 and 22, re spectively, Fig.1, the upper bearingmember -being'securedrto the end of the oven 2 and ;the lower) bearing member to ,one' of the vframe pieces23that supports'the oven. A control handle of valve operating handle 24 is secured fast to. the upper end of the rod 20 and is provided with a pointer 25which swings over'a graduated quadrant 26 formed on the bearing member 21.. The Xarrangement is such, as willbe evident from an inspection of Figs. 6 and 7, that the handle 24 can sw ng through an arc of 1809 only.

V Secured to the lower part of. this rod is a Theconstruction shown comprises an oven-' cam-.orother eccentric member 28, Figs.

pilot valve plunger 17. Mounted immediately above this cam 28 and also fast on the rod 20 is a sprocket wheel 29, as shown in Fig. 3, which is connected by a chain 30 to another sprocket wheel 31 secured fast to the stem 9 of the valve plug 8. It is contemplated'that the handle 24 can be moved into any one of four principal positions, as shown in Figs. 6 and 7, and it is evident that the extreme range of movement required of the valve plug 8 is 90, while the rod 20 moves through an angle of 180. Consequently, the sprocket wheel 29 has half as many teeth as the wheel 31.

It will now be clear that when the handle 24 is in its closed or off position, both the valves 7 and 14- will be closed. When it is desired to light the main burner the handle 24 is swung into its full on position thus opening both the pilot valve let and the main burner valve 7. This results in shooting a strong flame across the top of the main burner thus lighting this burner immediately upon the rush of gas thereinto.

I consider it preferable to have the cam 28 so designed that the pilot burner will be opened wide when the main burner valve is at some intermediate point, say its threequarter position, and that for positions in which the main valve is opened wider or less the pilot valve will be closed, emitting only a small keep alive flame. This is for the reason that when the oven is being heated up the main valve usually is wide open and after the temperature of the oven has risen to the desired point, the main valve then is closed to a position about half on. In either of these positions the pilot valve will be closed and thus the waste of gas which would take place if this valve were left open is avoided. danger of explosion is avoided since the movement of the main valve to-its wide open position necessarily carries the pilot valve through its wide open position due to the positive connections between the two valves,

and the pilot flame would be certain to ignite the gas flowing from the main burner.

A further novel feature of this invention resides in the construction of the main burner, and is best illustrated in Fig. 8. From an inspection of this figure in Fig.

3. it will be seen that the burner nipples are set at angles of approximately 60 with reference to each other. and are staggered. This relationship has the advantage of securing a better propagation of the main burner flame than is produced in the usual,

arrangement. Each of these nipples comprises a head 34-, the minimum diameter of which is at its outer end, and the surface of which flares outwardly toward the base. In other words, thehead of the nipple is tapered, roughly speaking, but the outer wall is curved inwardly in vertical cross sec- At the same time any material tion, as is clearly shown in the drawings. This construction, together with the fact that the nipple sets up for a considerable distance above the peripheral surface of the burner pipe 3, is of advantage in producing a very complete combustion of the gases. That is, the gas, as it comes through the mixer 6 becomes mixed with a certain amount of air, but the gas takes up at this point only about one-third of the volume of air required to burn the gas. The other two-thirds must be taken from air surrounding the flame, and this air is commonly referred to as secondary air. The peculiar nipple construction shown is of advantage in promoting a better circulation of this secondary air and therefore producing a more complete combustion.

This nipple construction also is of advantage from a manufacturing standpoint since the nipples can be made individually by automatic machinery, and the shank 35 is then driven into the hole in the burner pipe 3 until it brings up against the shoulder at the base of the head 34. It is a simple matter to make this driving lit and it produces a tight joint between the burner pipe and the nipple.

A modified construction for effecting the control is shown in Fig. 10. In this arrangement an arm 36 is secured fast to the rod 20 in place of the sprocket 29, and a bell crank lever 37 is secured to the spindle of the valve plug 9 in place of the sprocket wheel 31. v with one arm of the bell crank lever 37, the lengths of the arms 36 and 37 being made A rod 38 connects the arm 36" a movement of 180 of the arm 36. The

other arm of the bell crank lever 37 is connected by a link 39 to the sliding sleeve 40 of the Hale mixer.

It will now be seen that this invention provides a very efiicient form of burner mechanism which is very economical to manufacture and very convenient to control.

While I have herein shown and described the best embodiment of the invention of which I am at present aware, it will be evident to those skilled in this art that this embodiment may be modified in details of construction without departing from the spirit or scope of this invention.

What is claimed asnew is:

1. In a gas heated apparatus, the combination of a main burner, a pilot burner, independent valves controlling the flow of gas to said burners and located adjacent to each other, one of said valves having a reciprocatinggas controlling element and the other a rotary gas controlling element, an operating handle, and means connecting said handle with both of said valves for operating them in a predetermined rela tionship.

'2. In a gas heated apparatus, the combination of a main burner, a pilot burner, a rotary valve controlling the flow of gas to said main burner, a plunger valve controlling the flow of gas to said pilot burner, a cam for operating the plunger of the latter valve, and operating mechanism for said valves comprising means positively connecting said rotary valve with said cam whereby said valves are moved in a predetermined relationship to each other.

3. In a gas heated apparatus, the combination of a main burner, a pilot burner, a rotary valve controlling the flow of gas to said main burner, a plun er valve con-1 trolling the flow of gas to said pilot burner, a rotary element for operating the plunger of the latter valve, an operating handle, and means positively connecting said handle chain mechanism,

4. In a gas heating apparatus, the combination of a main burner, a p11ot burner, a

rotary valve oontrolling'the flow of gas to said main burner, a plunger valve controlling the fiowof gas to said pilot burner, a cam for operating the plunger of the latter valve, a shaft on which said cam is mounted, an operating handle fast'on said shaft, and a positive connection between said shaft and said rotary valve whereby the movement of said handle operates both of said valves ina predetermined relationship to each other.

In testimony whereof I have signed my name to this specification. NATHAN B. DENISON. 

